| 摘要 |
PROBLEM TO BE SOLVED: To obtain an isobutylene-based copolymer composition with less discoloration and hardly corroding an evaporator, drying equipment at processing and molding equipment. SOLUTION: This isobutylene-based block copolymer composition comprises a block copolymer (A) obtained by successively adding a cationically polymerizable monomer component essentially comprising isobutylene and a cationically polymerizable monomer component essentially comprising a monomer different from isobutylene and copolymerizing them in the presence of an initiator and a Lewis acid catalyst, a phenolic antioxidant (B), an organic phosphite-based antioxidant (C) and a hydrotalcite type compound. COPYRIGHT: (C)2006,JPO&NCIPI
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